lean2/src/kernel/formatter.h

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/*
Copyright (c) 2013 Microsoft Corporation. All rights reserved.
Released under Apache 2.0 license as described in the file LICENSE.
Author: Leonardo de Moura
*/
#pragma once
#include <memory>
#include <utility>
#include "util/sexpr/options.h"
namespace lean {
class expr;
class environment;
/** \brief Return true iff \c t contains a constant named \c n or a local constant with named (pp or not) \c n */
bool is_used_name(expr const & t, name const & n);
/**
\brief Return the body of the binding \c b, where variable #0 is replaced by a local constant with a "fresh" name.
The name is considered fresh if it is not used by a constant or local constant occuring in the body of \c b.
The fresh constant is also returned (second return value).
\remark If preserve_type is false, then the local constant will not use binding_domain.
*/
std::pair<expr, expr> binding_body_fresh(expr const & b, bool preserve_type = false);
/** \brief Return the body of the let-expression \c l, where variable #0 is replaced by a local constant with a "fresh" name. */
std::pair<expr, expr> let_body_fresh(expr const & l, bool preserve_type = false);
class formatter {
std::function<format(expr const &)> m_fn;
options m_options;
public:
formatter(options const & o, std::function<format(expr const &)> const & fn):m_fn(fn), m_options(o) {}
format operator()(expr const & e) const { return m_fn(e); }
options const & get_options() const { return m_options; }
};
typedef std::function<formatter(environment const &, options const &)> formatter_factory;
std::ostream & operator<<(std::ostream & out, expr const & e);
/** \brief Create a simple formatter object based on operator */
formatter_factory mk_simple_formatter_factory();
typedef std::function<format(formatter const &)> pp_fn;
}